Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco 70
#11

Ok, maybe the osc. coil is defective, but why does it test good and why do I have good grid voltage at all frequencies? I just noticed one other thing. While I have great volume, over the dial, I find that it is slightly difficult to tune in a strong station because the tuning is broad. I can turn the dial through about a 30 Khz range on strong stations. I suspect that the oscillator is working correctly, however maybe not at the correct frequency, because the average super has about -5 to -25 volts on the osc grid. On mine the grid, using a VTVM reads between -21 to -25V throughout the tuning range. Yes, a scope or frequency counter would help, but those I no longer own. The oscillator is definitely working. Correct frequency???


Messages In This Thread
Philco 70 - by Tubesforme - 03-26-2017, 07:22 PM
RE: Philco 70 - by Radioroslyn - 03-26-2017, 08:49 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 08:31 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 10:09 PM
RE: Philco 70 - by morzh - 03-26-2017, 08:50 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 03:15 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 10:06 PM
RE: Philco 70 - by Radioroslyn - 03-26-2017, 09:43 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 03:07 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 03:28 PM
RE: Philco 70 - by Radioroslyn - 03-27-2017, 04:22 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 05:04 PM
RE: Philco 70 - by Tubesforme - 04-06-2017, 03:02 PM
RE: Philco 70 - by Radioroslyn - 03-27-2017, 05:08 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 08:26 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
Tim - Photos of 8 octal tube sockets. (Top and bottom) Send me a PM if you're interested.RodB — 04:11 PM
VTVM meter moves when my hand is next to it & not on
Haha! I hope so. It seemed rather lost and forgotten languishing in the frozen Northeast of England.EdHolland — 02:36 PM
VTVM meter moves when my hand is next to it & not on
Ed - it's in the Cayman's enjoying the good life.RodB — 02:14 PM
VTVM meter moves when my hand is next to it & not on
Static electricity - but the other chaps beat me to it again. I've seen this before with analogue meters. I've also ...EdHolland — 01:56 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Hi Paulo, Welcome to the Philco Phorum. I can see why you want to find good reproduction parts. That is a bea...MrFixr55 — 11:10 PM
HiFi (Chifi) tube amp build - but my own design.
Tim, I have some bakelite sockets in my work shop that I can dig up. I believe quite a few are NOS. I will take photo...RodB — 10:03 PM
Philco 610B oscillator wiring
> The cathode as noted is wired directly to the ground side of the heater filament for that tube, not to the #17 and ...Radioroslyn — 08:12 PM
HiFi (Chifi) tube amp build - but my own design.
Tim; I noticed your post a little late, but I would take one of the junk sockets and try to break a chunk out of it wi...Arran — 08:07 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM

[-]
Who's Online
There are currently no members online.

>